The lack of some features available in Squid-2.x series. See the regression sections below for full details.

+

eCAP library version 0.2.0 and later are not supported. See eCAP section below for details.

+

CVE-2009-0801 : NAT interception vulnerability to malicious clients. This is fixed in 3.2 series.
+Some attempts have been made to port for 3.1, but the unreliability of NAT handling in 3.1 makes this unsafe.

Currently known issues which only depends on available developer time and may still be resolved in a future 3.1 release are: